"During the year 1944 Mrs. Ava Helen Pauling worked for several months in my laboratory at the California Institute of Technology. Her task consisted in the separation by chromatography of various colored derivatives of plant products and the determination of their physical constants. I remember with a great deal of pleasure her participation in our research which she carried out to my full satisfaction. I have no hesitation in recommending her for an appointment which would enable her to return to the laboratory."
A. J. Haagen-Smit. Letter to Linus Pauling. October 27, 1967.

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